Spring harrow tooth



Fi led Dec. 2 1928 Fig.

Fat'entecl'May; 19, 1931 1,sos',4s1i

' 1 aAoon v. mrRnforBnnn, cnnn'onm srzamennnnow "roo'rn' Application filediDecember 26, 1928 Serial No. 328,513.

In the present state of the'art', springtooth I harrows are commonly provided with tooth carrying shanksfmade -of' flat spring steel. straps, that are mainly straightin transverse section and are longitudinally curved to anappropriate formand that are adapted at the upper end to be detachably fastened toa cross bar of a harrow frame, and to stand forward,

ly and downwardly aslant at thelowerend,

10 and that'are adapted to carry a forwardly extending detachable tooth thatis fixed to the a lower end of the shank'by oneor more'bolts passed 7 through bolt holes in the shank ,and the tooth, andsecured by nuts. 1 I

16 Such detachable harrow teeth; are

monly double pointed longitudinallyarcuate transversely V-shape steel drop forgings have.

mgan arcuate longitudinal middle ridge in front and a groove complementary theretoat 20 the rear, and it is known to theprior art that the tooth, and the lower s end: of the shank,-;

' may be fitted together SPOOILfHQShlQIl and fastened together by asingle bolt.

rowsof'this type as heretoforehowmamong; which may be mentioned; the clogging of the; teeth andshank withweedggrass and other dbris, and the setting up ojfa vibrating ac-'- tionof the shanks and teeth. b Anobject of this invention is to avoid such; difficulties and furthermore to provide means. whereby points of various, widths may be a used on the spring teeth, and-the teeth will be firmly held'andomay be'jvreversed with comparative ease and convenience with minimum lossoftime,

This invention comprises anovel construe: tion ofspring tooth shank, anda novel as: sembly of parts that are combined to accom-; plish theforegoing objects;

The novel spring tooth shank toy I have in- 1 ventedis provided at itslower or free end;-

' with an elongated recess havingat itsfront a longitudinal anteriorly concave iarcuate ridge adapted :to be fitted "uponby the rear face of a :harrow tooth pQint. -,of,the usua l,-

and also of a changedform; and is provided;

on its rear face with a groove complementary to the front face, and is provided 'centralli'y witha bolt-hole to "accommodate a rearwar ltoothisfthatithe curved main body of fiatv lyt projectinglburr from the tooth point, and a-plo'w mold-board bolt inserted from front to rear and secured by a nut accommodated by the grooveinfthe rearface of the seat.

The rear'faceof the forward end of the harrowtooth is pointed and bevelled to an edge adapted to fit-against therearface of the harrow tooth point. 7

A' feature of thenewly-invented spring spring jsteelnterminates at its lower or free end in an arc'uateportion, theedges of'which are rearwardly bent to form a groove fitted' to, the grooved rearside of the harrow tooth ipoiDtQf i An advantage of the construction of the burr andits seat is that the point can be im'-" movably fixed to the spring tooth bya single bolt. Anotherfadvantage of the invention 7 is that the liability of; clogging is minimized 170 infthatthe' spring toothis provided with a rearward. kink orfdefiection just above the" I upper end of the harrow tooth sothat as ac Various diifioult'iesarise inthe use of'harcumulations' of trash are forced up overthe top ofthe upperendof the tooth vpoint, the '75, same will be loosened from packed position and will fall {from the tooth; This shedding ofthe accumulations is facilitated by the bevel of the frontof thetooth end to which bevel the forward faceqof the kink is tangent. ,The novel form of the tooth and tooth point at.theibolt'holestherein also insure a tight firmfit] '1 i v t Other objects, advantages and features of invention mayappear from the accompanyingdrawingathe subjoined detailed description and theappended claims. I

I The "accompanying drawings illustrate the invention. a .t

Figure 1 isa side view of the harrow spring tooth with point. attached and fixed in position onZ'thec'ross bar .ofa harrow frame. l

f F igl2 is' arear view of whatiisshownin {Figi B is a fragmental frontview of what; is shown in Fig. 1', the fragment of the. harrow frame being omitted and the attaching 7 end of the" tooth being broken away.

. aview analogous to Fig.3 sho w-v ing the appearance when the tooth is supplied with a narrow point.

Fig. is a fragmental axial section of the spring tooth and point on line indicated. at 5 m5, Figs. 2 and 3.

Fig. 6 is a cross section on line m6, Fig. 5. Fig. 7 is-acrosssection online 1117, Fig 5."

Fig. 8is a cross section onlinewfi, Fig ."5.fl Fig. 9 is a side elevation of the port-ion 10 of the spring tooth shown inF ig d- Fig. 10 is a perspective front view of the portion of the spring tooth showninFign- 5 and also indicates, detached therefrom, a front view of the point shown in said-Fig. 5.

Fig. 11 is a perspective fragmental, rear view of theportion of the spring tooth shown infFigsxfr, 9 andlt).

Arrows onl'the section lines in theseveral' views indicate the direction of sight on the 'resplective'sections.

e'springtooth l is of conventional form exce "at its lower or free end where it is provided with a seat Q'haVing; ati-tsfront a P 10!! :tndinalanteriorly concave arcuate ridge "3 s5 4 offa harrow'toothpoint 5; The pointseat is rovided with a' bolt" hole: 6* through the ri' geandis'provided on the rear side with a c anneli' adapted'to accommodate anut'S' and acounter-sunk bolt 9 in the counter-sunk, bolthole '10 ofuth'e point vand'the bolt hole 6 of the tooth. The under rear' side of the shanmabolt insaid holes and a nutacoommodated in'theconcavity of the shank securing springtooth is bevelled'or chamfered as at llatthe end'of 'the'spring tooth;

this'novel' construction: and arrangement' the "springtooth may be fitted with any of the standard harrow teeth points now on the'market 'inzvarious widths as indicatedin Figs. 3and'4. i

n Fig.3thepoint5 is of the samewidth' asthespringtooth while in Fig. 4 the point 5 is narrower, and in suchnarrower 'f'orm' the .cuttingedge' 12*of'the tooth serves to'cut the ground, the'moots'andtth'e surface'weeds" with -wliioh the edge12' of the sprin'g tooth" contacts and in any instance such cutting edge does not afford an abutment against? which the weeds and debris will become clogged, andthe toolpasses through the soil.

more freelythan hasiherctofore been possi ble with the teeth of. sprin tooth barrows:

The kink or rearward defi'eetion'liiof'the' spring toothabove the tooth point seat 2*is. provided to abruptly release the pressure from below upon the tooth clogging accumulations forced up the tooth as the tooth.

i tooth above-thebolt holes and avmg a-kink" above the recess; the forward faoe of'the kinkadvanc'es,thus allowingthe weeds, grass and trash to shake loose and drop to the ground behind-the tooth. I V, In drop forging the tooth point I form'za' front countersink 1 1 to'receivethe bolthead,

r dly rojecting marginal burr apted tobe fittedupon by the rear face hole, adapted to accommodate the projection 15, thus to increase the security of the attachment of tooth point to the tooth when the bolt is inserted and the nut screwed home. The rear face 17 of the tooth at the hole 10 is flattened so that the nut will fit snugly thereon-when screwed home.

I-claim-:-- 1. Arharrow spring tooth having a tooth point seat .providedwith a countersunk boltole; a tooth poi'nt having a bolt-hole counat the front and a projection at the back to engage the countersink in the point seat; aboltinthebolt-holes and a nut on the bolt adapted to hold the bolt head seated in thecountersinkbfi the tooth point.

Incombination; a springharrow tooth shank having a longitudinalarcuate anteriorlyconcave tooth holding recess, and that is of an-anteriorly convex- V' shape in cross-section; said shank being rovided with an anteriorl countersunk bolt ole; the osterior faceo said recessionnin a seat adaptedto chamber anut for atoothfiiolding bolt in said bolt hole, a harrow tooth pro- 9o" videdwithan anteriorlycountersunkbolt hole and with ax-"posterior burr at the margin of said bolt holeto fit in the countersink of the; shank, the portion of; said tooth above said boltholebeing accommodatedin the recess 99* ofthe' shank and said himbeing accommodated in -the-counte1sink of the hole in the the bolt in said bolt hole and holding sai burr seated in the countersink in the shank.

3. The combination. with a barrow toothhaving a bolt hole, ofa s ring shank having a'kink and havingga hole between the kink andthe'dower end-of theshank, and ma also having; below: the a seat: that w' commodatesthe portion of the tooth that is abovethebolt hole so that the lowor end of the kink forms a smooth upward and rearward continuation of the -forward faceof the upper end of the-tooth thus to allow compact"- e aooumulation of'growth toloosen and beshunted oflof the shank.

4 In a harrow, the combination with a tooth having a longitudinall concave andiia transversely convex front an having front bevehfaces at -both'ends and a bolt hole between such faces of-aa spring shankhaving a'bolt'hole-to register with thebolt'holeof the tooth, and a recess extending abovethe. bolt holeto accommodatethe ortionof the said shank having a kink, and also having below the kink a seat that accommodates the upper portion of the harrow tooth so that the lower end of the kink-forms a smooth upward and rearward continuation of the forward face of the upper end of the tooth thus to allow compacted accumulations o growth to loosen and beshunted off of the shank. I

6. In a harrow, the combination with a tooth having front bevel faces at both ends; of a spring shank, to the front face of which the tooth is attached, said shank havinga I kink, the forward face of which is tangent to the front of the tooth so that accumulations forced up off of the front of the tooth during the harrowing operations will become loosened and slide off "of the shank.

In testimony whereof, I have hereunto set my handat Los Angeles, California, this 26th day of October, 1928.

JACOB V; DYRR. 

